The carbon 13 breath test is one of the common clinical methods of detecting H. pylori, and the normal value is generally less than four or within the reference range of the test, and if there is more than that, it is considered that there may be an infection with H. pylori, which needs to be measured before the test in a fasting state or two hours after a meal. In addition, recent antibiotics and drugs that protect the gastric mucosa, such as proton pump inhibitors and other sensitive drugs, may cause false negative test results. Because H. pylori infection is closely related to chronic gastritis, peptic ulcer and gastrointestinal tumor, if the test is positive, it is recommended to consult the gastroenterology department of the local hospital and perform regular antibacterial therapy, such as triple therapy (omeprazole, clarithromycin, amoxicillin, etc.) for about half a month, followed by regular review or gastroscopy to clarify the pathology of treatment, if there are symptoms, it is recommended to review after three months.